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SubjectRe: [RFA][PATCH 07/27] MIPS: ftrace: Add call to ftrace_graph_is_dead() in function graph code
Ralf,

Can you give me your Acked-by on this and patch 21. I'm still waiting
on a few arch maintainers for acks before I can push this to my
for-next branch.

Thanks,

-- Steve


On Thu, 26 Jun 2014 12:52:28 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
>
> ftrace_stop() is going away as it disables parts of function tracing
> that affects users that should not be affected. But ftrace_graph_stop()
> is built on ftrace_stop(). Here's another example of killing all of
> function tracing because something went wrong with function graph
> tracing.
>
> Instead of disabling all users of function tracing on function graph
> error, disable only function graph tracing. To do this, the arch code
> must call ftrace_graph_is_dead() before it implements function graph.
>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
> ---
> arch/mips/kernel/ftrace.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
> index 60e7e5e45af1..8b6538750fe1 100644
> --- a/arch/mips/kernel/ftrace.c
> +++ b/arch/mips/kernel/ftrace.c
> @@ -302,6 +302,9 @@ void prepare_ftrace_return(unsigned long *parent_ra_addr, unsigned long self_ra,
> &return_to_handler;
> int faulted, insns;
>
> + if (unlikely(ftrace_graph_is_dead()))
> + return;
> +
> if (unlikely(atomic_read(&current->tracing_graph_pause)))
> return;
>



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